SSIS Job Never Ending

I have some SQLAgent jobs that call some SSIS packages.

Sometimes the job never ends and I have to terminate the SQL Agent job.

It appears to be 'stuck'.

For example, I have a job that usually runs no more than 1 minute.

This job had been running for over 8 hours.

After terminating the job, everything appeared to be OK, and the job would run under 1 minute.

Would losing a database connection cause this?

Is there anything to prevent this from happening.

Thanks.